The rapid development using the access network of broadband recently is broad band become marked feature probably the most of growth and development of access network. The latest statistics data display which Secretary of state for Information Industry releases, by The month of january of 2006, the amount of customers of Internet’s broadband access in our country exceeded 38,620,000, and it is still ongoing keeping snowball. Additionally, video when needed, Network Games and IPTV isometry bandwidth business are regarded as because the new reason for development of business through the telecommunication operator and operator of broadcasting and television progressively, customers are growing towards the interest in placing the bandwidth constantly, it’s already very hard for that Off-The-Shelf broadband access way depending mainly on ADSL to satisfy user’s needs for respects like the high bandwidth, two-way transmitting capacity and safety,etc.. When confronted with this predicament, telecommunication operators of numerous nations cast concerned sight on FTTH again, having to pay close focus on the very fact enthusiasm runs high daily too to FTTH. First, FTTH realizes technology From Er early indicate point MC (media ripper tools) Technology evolves to become nowadays to click to multi-point PON technology, the implementation manner of FTTH went through development and development in excess of 10 years. 1.Place it card inserts technology to become to transform electric signal with whom optical signal continue in a lengthy distance, fail only Indicate pointing within the network, FTTH FTTH of technology, only Indicate point, make use of an optic fibre from central office to every user, the climbing-climbing down speed can achieve 100Mbit/s even 1000Mbit/s. Ripe, structure / characteristic with simple technology, with better safety of getting items that could indicat indicate only place technology. However the disadvantage of these technological maximum is to lay a lot of optic fibres and lightweight transceivers, network lay difficult under not employing situationing on the massive, equipment cost tough to drop, even can rise, consider, realize the intersection of transition and technology of FTTH, appropriate for that intersection of network and initial stage of development the intersection of quantity of customers and less stage relatively. It’s mainly MC that Er early to simply place technology Indicate point. MC one mere an easy one / electricity or electrical/optical ripper tools, convert the electrical signal to optical signal to take the transmission in a lengthy distance, it doesn’t cope with the information packet, therefore the price is cheap. Emerging mere accession equipment Indicate point according to Ethernet previously 2 yrs, getting mainly adopted IEEE802.3ah normal single fiber two-way 100/1000Mbit/s optical interface, the climbing-climbing down switches into WDM method to use different wavelength to deliver correspondingly. Cellular topological structure, can adopt the mere transmission mode Indicate reason for single stage which doesn’t have the drop point, may also adopt mere transmission mode of two grades with active drop point. Within the second way, the part from the active drop point continues to be frequently disposed the Ethernet switchboard from the optical interface to understand. 2. last industry generally acknowledged realization the schemes first-selecteds of FTTH already PON technology FTTH PON technology. PON product is through the apparatus OLT of local side (the terminal station of sunshine line) , user apparatus ONU/ONT (optical network unit / mere network terminal) And ODN (mere distribution network) Constitute, the so-known as ” passive ” ,Mean ODN is comprised of Passive Optical Componentses for example passive optical tapping element and optic fibre,etc., excluding any active device. PON technology adopt the intersection of point-to-multipoint and topological structure, descent or more run pass TDM and also the intersection of TDMA and also the intersection of way and transmit data correspondingly. PON technology could be subdivided into several kinds, different data link layer technologies have combined and created different PON technology using the physical layer PON technology, for instance ATM + PON has created APON, Ethernet + PON has created EPON, ATM/Jewel + PON has created GPON, they are maximum variations between various PON technology. PON technical advantage includes the challenging thunder and lightning damage and branched out interference from the Passive Optical Components, network architecture flexible to grow, share, present line segment optic fibre to can help to save, it lays cost, business to become transmittance fine getting the intersection of multi-service and holding capacity and simple management maintain etc. while being easy. At the moment, we’ve got the technology of associated with PON is EPON and GPON technology. (1)EPON technology EPON is as simple as EFM (EthernetintheFirstMile) established in November of 2000 The job group proposes and standardizes in IEEE802.3ah standard, it regards Ethernet as service providers around the PON layer, the up run transmits the information flow by sporadic Ethernet packet mode. EPON can provide the shaped 1.25Gbit/s line speed from the climbing-climbing down, the lower-line speed is really a system of 10Gbit/s in span of studying positively too. Because EPON switches into Ethernet to capsulate the way in which, is extremely appropriate for bearing the load of IP business, accord using the quick and violent development trend of IP network, in lots of types of technology according to PON, EPON because the benefits of its technology and cost regarded as the one thing future master FTTH realizes technology. But IEEE original aim of making 802.3ah is perfect for placing IP data traffic, haven’t considered TDM business card inserts the special requirement of respects for example clock synchronization, time delay and trembling,etc., so standard Ethernet that EPON adopted capsulated the way in which introduced a fatal disadvantage – -It is not easy to deal with the load of or circuit type TDM business of person type of data,etc. from the speech. Though at the moment domestic and foreign to take positive research and make certain achievement towards the intersection of TDMoverEthernet and technology, but not so ripe, rigorous QoS which should totally achieve TDM business and wish faces the functional difficulty especially, it has introduced certain restriction to use of EPON. However a satisfying the first is, due to finding the domestic telecommunication operator to still greater influence of TDM business demand, our country most of the intersection of EPON and manufacturer continue, expand towards the intersection of IEEE and standard, bear the load from the intersection of TDM and also the intersection of economic and, continue the technology in EPON, China EPON communication sector standard has suggested relevant requirement of that as well. This will make EPON apparatus on Chinese market enhance the access capacity from the multi-service greatly, the simplex IP business was placed and progressed into the entire business and placed from initially. (2)Exactly why GPON technological ITU-T does not succeed to APON technology, regard APON standard because the fundamental chassis, redesign new transmission rate and TC of physical layer (transmit and assemble) Layer, has launched GPON standard of series G.984.x. The transmission rate of downstream more GPON can depend on 2.488Gbit/s, the transmission rate of upstream maximum reaches 1.244Gbit/s, the transmission distance can be 20 kilometers a minimum of, possess the qualities the high-speed sends high-effectively. GPON has adopted 2 kinds of capsulation ways, besides traditional ATM, also have adopted a brandname-new GPON peculiar TC layer to evolve the agreement Jewel (GPONEncapsulationMode within the TC layer, GPON capsulates the mode) . Jewel is the fact that GPON peculiar TC layer adjusts the agreement, its proposition originates from the most popular framework considered GFP, think about the intersection of PON and also the intersection of network and lots of ONU, situation that multiple port multiplex simultaneously, introduce PortID. Common framework agreement GFP based on SDH, one kind could be by sealing various intelligence signals to place in to the common standard signal from the existing SDH network and adapt mapping technology transparently, high-effectively, can meet any user’s signal format and network rule associated with a transmission, namely can convey the pronunciation, data and video signal based on the natural form, don’t need the package layer of more ATM or IP, flexible requirement once the satisfiable business provider is providing the company. Due to implementing Jewel to capsulate the way in which, the TC layer of GPON is synchronous essentially, timing along with other anisochronous business making GPON support to hold the finish, especially could be flexible rich in quality straight to support TDM business. By PLOAM (physical layer OAM) from the physical layer And OMCI around the senior level (ONT handles the control interface) The constituent OAM mechanism from the agreement is very complete too. Around the bearing capacity from the business, GPON has extended the entire business of APON and placed the concept, its peculiar TC layer can totally offer the business QoS to ensure to capsulate the way in which too. The GPON series standard that ITU-T makes is very complete, but quite complicated simultaneously, the conventional is launched to date formally, the world several company for example FlexLight, BroadLight, OpticalSolution,etc. claim, released, accord using the intersection of G.984 and canonial the intersection of GPON and product only. And seen from apparatus realization way, the current GPON machines have essentially all selected to simply realize Jewel capsulate the way in which, rarely adopt ATM to capsulate the way in which. So that it was the relative great of cost of GPON items that introduced, are recognized FTTH utilizes large cost pressure by GPON at present stage. Second, domestic FTTH evolves FTTH at the initialization phase from the market in your own home at the moment, includes a distance from large-scale commercial arrangement. The telecommunication operator, to recognizing FTTH is commercial and making popular or suspicious of on the massive, therefore has mostly adopted ” Test positively, dispose prudently ” Tactics. China Telecom has released the job of starting an airplane pilot project in Wuhan, Beijing, Shanghai and Guangzhou,etc., China Netcom starts to layout and test in commercial center and top-grade residential district of Beijing along with other places. Remain in ground pad operator for example Tyronn,etc. based on completed try internet, expand and explore new provision and operation mode hard. Real estate developer regards FTTH because the fast-selling feature from the top-grade house property too, to be able to enhance the selling added value, accelerate selling the rate. Each one of these, have marketed FTTH in our country to place technical popularization positively. Based on present development, our country mainly has got the following four modes to build up FTTH. (1)And operator’s leading factor of telecommunications is implemented. Including 2 kinds of situations, the first is that new developing telecommunication operator utilizes FTTH/P to produce the company within the in a nutshell section of pipeline / optic fibre resource fast, another type of FTTH testing plus some small-scale released through the leading telecommunication operator is commercial. (2)The federal government will get involved, real estate developer implements. This type of mode is principally through the information-based department of municipality from enhancing the neighborhood information-based level, promote urban information fundamental framework quality and position from the level and hang in an exciting-round way, get involved with FTTH and make and provide to FTTH investor and square and certain support of operation in the policy, fund positively, but real estate developer wishes to promote the standard of the commercial residential building by lounging FTTH network, increase then sell the feature. (3)Operator implements the client premises network by cooperating with property developer or property. This type of mode is principally by real estate developer (or even the property) of customer premises network operator and recently-built Residential Area or completed Residential Area Cooperation, the client premises network operator accounts for an investment, construction, operation and upkeep of FTTH customer premises network, offer to user of Residential Place to every fundamental the intersection of telecommunication and also the intersection of operator and (for example telephone, broadband) telecommunications service a myriad of with the intersection of FTTH and customer premises network Equal for access,customer premises network operator is until telecommunication operators fundamental offer service of placing to last earnings during these. This type of mode has damaged the telecommunication operator from our network ” The final kilometer ” Monopoly. (4)The commercialization that apparatus producers promote is examined. This type of mode is principally centered and implemented by apparatus producers, are essentially all small-scale tests, continue by and also the relation building or cooperation of Residential Area property. In technology selection, our country more choose EPON technology to understand FTTH application at the moment, this really is due to the fact GPON apparatus continues to be developed gradually constantly, you will find couple of producers, but it is very simple for EPON apparatus to understand, you will find more relatively lower selective producers of cost. The domestic manufacturer bears the load from the expansion on TDM professional ability in EPON, has gained more extensive development space for use of EPON apparatus to some extent. Third, our country developed FTTH and been around Q Now you ask , based on starting FTTH applied experience fitness center abroad, our country faces the issue from the following several respect in developing FTTH, these questions have restricted FTTH rise in our country to some large degree. 1.Lack ” one grade of use of killer ” ” one grade of use of killer ” It’s the question that many technology should be faced when being released, FTTH isn’t any exception. FTTH find, accord with many the intersection of killer and magnitudes of use of user’s needs while being difficult really at the moment, the primary kind of traffic offered continues to be much like DSL. Key business that IPTV is recognized as to advertise the introduction of FTTH, but respects like the controlling, copyright protection, content supervisory and appropriate commercial mode of the trade involved between telecommunications and also the broadcasting and television trades,etc.. Except the telecommunication operator should provide the respect to cooperate with operator of broadcasting and television within the content under your own accord, based on the encounters of Japan, South Korean development, the federal government has not avoidable function cellular formulation from the regulation and marketing the developing of industry chain. 2.It had already demonstrated FTTH utilizes there’s not technological difficult point the cost required to further reduce practice, but should make FTTH result in success, must further lessen the relevant production cost, can consider from developing the commercial nick of system level, get the new low-cost optical device which meets FTTH characteristic and develop indoor optic fibre and single core optical cable,etc. respect likely to install from the inexpensive and it is go about happening. Within the initial stage of growth and development of FTTH, especially underneath the initial mounting rate not high situation within the building or Residential Area, it’s very difficult that those that if you wish to result in the cost of FTTH position with ADSL are close, but need difficult to make FTTH have more powerful competition around the cost performance with the advantage with respects like the wide and kind of traffic,etc.. 3.It’s a difficult problem which PON technology faces at the moment the intercommunication problem of fixing the tools solves the intercommunication problem between different manufacturer machines, also FTTH might get among the secrets the operator certainly as well as in a far more cost-effective manner popularize to use. This needs relevant nick manufacturer and joint efforts from the system manufacturer, might even take some producers to sacrifice some a person’s own interests to be able to achieve a contract. 4.Getting introduced our prime bandwidth of placing the subnet section to pressure FTTH from the bandwidth from the metropolitan area network, the answer backbone network after putting together for metropolitan area network and knowledge has introduced the large bandwidth pressure, present metropolitan area network and core network framework an internet-based switchboard / router,etc. aren’t enough to deal with the large traffic flow that FTTH bring. To be able to result in the high bandwidth ability of FTTH really felt by user, must eliminate the bottleneck around the network, even construct the machine framework of generation x Network. 5.The use of the possession question FTTH from the cable has submit the issue the enter to line lays possession again, the lengthy distance transmitting capacity from the optic fibre helps make the local side apparatus far change out outdoors the plethora of Residential Area, who so bulky fiber optic cable line possession ought to be belonged to, it’s FTTH networking and government policy that control among the questions that needs to be considered especially. Additionally, for that competition, it causes repeated construction to most likely know, how to prevent is really a question requiring to look at. 6.Further strengthening the job of canonicalization of standardized job and developing to FTTH industry and lowering costs has direct relations. Should step-up making the FTTH series standards from the appropriate national conditions in our country while taking part in work of worldwide standardization positively, including architecture, apparatus system specs, network management, key optical device,etc.. Range from the indoor optic fibre routing norm mainly in the building, it’s a standardized blank both at home and abroad at the moment. The intersection of FTTH and relevant canonicalization our country finish or keep on already work, focus on tool and apparatus system specs mainly at the moment, later on should think about, transfer the intersection of kit and intercommunication, network architecture and business to, employ especially.
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